| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package kafka.utils |
| |
| import java.util.concurrent.{CountDownLatch, TimeUnit} |
| |
| import org.apache.kafka.common.internals.FatalExitError |
| |
| abstract class ShutdownableThread(val name: String, val isInterruptible: Boolean = true) |
| extends Thread(name) with Logging { |
| this.setDaemon(false) |
| this.logIdent = "[" + name + "]: " |
| private val shutdownInitiated = new CountDownLatch(1) |
| private val shutdownComplete = new CountDownLatch(1) |
| |
| def shutdown(): Unit = { |
| initiateShutdown() |
| awaitShutdown() |
| } |
| |
| def isShutdownComplete: Boolean = { |
| shutdownComplete.getCount == 0 |
| } |
| |
| def initiateShutdown(): Boolean = { |
| this.synchronized { |
| if (isRunning) { |
| info("Shutting down") |
| shutdownInitiated.countDown() |
| if (isInterruptible) |
| interrupt() |
| true |
| } else |
| false |
| } |
| } |
| |
| /** |
| * After calling initiateShutdown(), use this API to wait until the shutdown is complete |
| */ |
| def awaitShutdown(): Unit = { |
| shutdownComplete.await() |
| info("Shutdown completed") |
| } |
| |
| /** |
| * Causes the current thread to wait until the shutdown is initiated, |
| * or the specified waiting time elapses. |
| * |
| * @param timeout |
| * @param unit |
| */ |
| def pause(timeout: Long, unit: TimeUnit): Unit = { |
| if (shutdownInitiated.await(timeout, unit)) |
| trace("shutdownInitiated latch count reached zero. Shutdown called.") |
| } |
| |
| /** |
| * This method is repeatedly invoked until the thread shuts down or this method throws an exception |
| */ |
| def doWork(): Unit |
| |
| override def run(): Unit = { |
| info("Starting") |
| try { |
| while (isRunning) |
| doWork() |
| } catch { |
| case e: FatalExitError => |
| shutdownInitiated.countDown() |
| shutdownComplete.countDown() |
| info("Stopped") |
| Exit.exit(e.statusCode()) |
| case e: Throwable => |
| if (isRunning) |
| error("Error due to", e) |
| } finally { |
| shutdownComplete.countDown() |
| } |
| info("Stopped") |
| } |
| |
| def isRunning: Boolean = { |
| shutdownInitiated.getCount() != 0 |
| } |
| } |